package com.hmdp.utils;

import com.sun.org.apache.xalan.internal.xsltc.dom.FilteredStepIterator;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import javax.swing.text.DateFormatter;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorker {
    /**
     * 开始时间戳
     */
    private static final long BEGIN_TIMESTAMP = 1640995200L;
    /**
     * 序列号的位数
     */
    private static final int COUNT_BITS = 32;

    @Autowired
    private StringRedisTemplate redisTemplate;


    public Long getId(String keyPrefix) {
        // 1.生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowSecond - 1_640_995_200L;


        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        // 2.生成序列号，通过 Redis String 类型的自增
        Long count = redisTemplate.opsForValue().increment("inr:" + keyPrefix + ":" + date);

        // 3.拼接并返回
        return timestamp << COUNT_BITS | count;
    }

}
